1551216505111 has 16 divisors (see below), whose sum is σ = 1917383517504. Its totient is φ = 1222068582144.

The previous prime is 1551216505103. The next prime is 1551216505141. The reversal of 1551216505111 is 1115056121551.

It is a cyclic number.

It is not a de Polignac number, because 1551216505111 - 2³ = 1551216505103 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1551216505141) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36558916 + ... + 36601321.

It is an arithmetic number, because the mean of its divisors is an integer number (119836469844).

Almost surely, 2^{1551216505111} is an apocalyptic number.

1551216505111 is a deficient number, since it is larger than the sum of its proper divisors (366167012393).

1551216505111 is a wasteful number, since it uses less digits than its factorization.

1551216505111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73160490.

The product of its (nonzero) digits is 7500, while the sum is 34.

The spelling of 1551216505111 in words is "one trillion, five hundred fifty-one billion, two hundred sixteen million, five hundred five thousand, one hundred eleven".